# 输入
a = input("请输入:")
# 打印变量a
print(a)
# 打印字符a
print("a")
# 打印字符a,并以&为结尾
print(a,end="&")
# 打印字符b
print("b")
# 打印字符a和b，默认空格间隔
print("a","b")
# 打印字符a和b，间隔改为.
print("a","b",sep=".")
